Piston for automobile engines



Aug. 1 2 190. 1 J. MQKONE 1,772,565

PI STON FOR AUTOMOBILE ENGINES Filed Nov. 24, 1926 INVENTOR i150 rin 0N5 Patented 3 1 2, 12930 I ILEO"J."MCK ONE, OI J-HINNEAFQLIQrMINNESOTA rrsrou run hurouonn-r rmomss .np umim mm (November :24, 1192s. we no; 150537.

comes in contact with the -o linder walls,

especially-if themovementp the piston is somewhat irregular. This irregular .move- *ment offthe-piston-or a movement out of the rectilinearvline occurs fromrthe wearing of 1'5 the various parts "of 'o the piston I and u'suall causes anwimpactbetween the piston. and-0y inder MIL-commonly known as -piston.- It often happens that after the enslap. gine has been standing for quite aperiod, Z -that there; is practically no oil between the piston and the cylinder wally vWhen the engineis started, thepiston will make several v-reciprocationsbefore =the sameis well lubricated. This running of the engine Withinsufiicient "lubrication and the piston slap above mentioned, results in a scufiing or -marring of the piston.

It is an object of this. invention, therefore, to'provideya piston structure which will effectively prevent": iston slap.

It is another -o 'jeot of the invention to provide a'ipiston structure which will at all times insure 'sufiicientlubrication: of the piston and -;will also prevent scufling of the piston.

=I-t is another object of the invention to provide .a piston for an I internal combustion en- \gine such as aneutomobi'le engine whichhas in addition :to the usual ring orrin-gs used. circumferential portions in its walls made :of-' wood,- which portions :are disposed .at either side of the wrist pin.

Itismore 1 specifically -an object of the invention to provides, piston for-an automobile engine having ciroum'ferentially extend receivethe usual wrist-pin. The piston is pro ing segmental and comparatively with rings of :wood one above the wrist pinandon'e ad- Ijacen't the bottom o'f the skirt Ofthepiston.

Thesetand: other objects'andadvantages. of

rjthetinvention will .be (fully set iiorth ingthe following description cmade 'in connection with the-accompanying drawings, in which dike reference characters refer to :similar parts throughoutthe several viewsand in which 2-- p Fig. lie :1 side view of a piston embodying the invention, .a. portion thereof. being broken away and another portion shown in vertical section; r o .Fig'; 2fisahorizontal section t -ken on'line" 2-32 of Fig. -1,. asindicated-'by the-arrows; an -Figl 3Lis-a horizontal section taken on-line 3- 3- of'Fig. =1, aslindicated by the arrows.

Referring tothe drawings, a plston of "the usual typefor an automobile engine is shown,

comprising theslfirt portion having at each side-thereof the wrist pin bosses 5 bored to vided with a circumferential .groove. 6 ad vjacentits upper-end having therein an expansible ringo7 o'fth'e usualtype. The ring also has the lower-groove 8 adapted :to reiceive an oil -ring 9 indicated in dotted lines. The ,;piston j illustrated is of the" type "having circumferen'tially and vertically extending slotslOat each sidev of 'the-owrist pin bosses 5 and the piston is also shown ns having the vertical slots IOHat'the-bottomofthe skirt odividingt-the lower portion thereof into seg .ments.

In accordance with the present invention, the skirt isma'deo'fa somewhat thickened upper portion bet-ween the, groove-8 and the bosses 5 in Which-portion amide-groove 11' is formed. Ari-mg is disposedin groove 11 composed of a plurality of segments 12. The segments 12 are held in place by-a plurality of pins 13 driven therethrough and tightly I fitting in holes in the skirt 4. The segments 1 12 and pins 13 are made of wood and while various kinds of wood may be used, in practice maple has proven to ,be very eliicient. The skirt 4 is also formed with a somewhat thickened portion below the bosses 5 and adjacent the lower end of the skirt, which portion has a'groove 14 formed therein adapted to receive a comparatively wide ring also formed of segments 15. The segments 15 are held in place by pins '16 extending therethrough and through alined holes in the skirt 4. The pins 13 and 16 may be slightl tapered. The rings 15 and pin-"16 are also o wood. such as maple.

In operation the piston will beassembled in the engine as usual, to reciprocate in the cylinder. The rings .11, and 15 will be ar- LEo J. lilcKONE.

ranged to closely engage the cylinder wall. y The piston and cylinder are lubricated in the usual manner. The wood absorbs a large amount of oil and this oil is always retained therein sothat a lubricated surface is provided even if the engine has been standing idle for lon periods. The rings 11 and 15 being of wooiit is impossible for them to scratch or mar the cylinder wall. The rings also have vrynlittle friction with the side of the cylinder and it is possible to keep them in close engagement'with the cylinder wall. This cooperates in guiding the piston and keeping the same in a rectilinear path.. There is thus substantially no lateral movement of the piston and the piston slap is prevented. The

scufiing of the engine is'also eliminated and the consequent wear on the cylinder is also eliminated. -When a piston slaps or moves in an irregular path, it usually wears the I cylinder wall into an elliptical shape, causing leakage past the piston. ,This is eliminated inthepresent piston. As stated above, there is also always sufiicient oil present in the wood to furnish lubrication in starting the engine. The segments of the wooden rings can also be adjusted outward when desired, by placing shims in the rear thereof. This may be done'if the wooden rings wear appreciably, although in practice, very little wear occurson theserings. v 1

From the above description it is seen that agiplicanthas provided a very simple and e cient structure of a piston to be used in an internal combustion engine, and particularly .in an automobile engine. The pistons are easily and inexpensively constructed. The same have been amply demonstrated in actual practice and found to be,very successful and eflicient.

Itwill, of course,.be understood that various changes may be made in the form, details, arrangement and proportions of the parts, without departing from the scope of applicants invention, which, generally stated, 

